Qualcomm filed lawsuits in China seeking to ban the sale and manufacture of iPhones in the country, the chipmaker's biggest shot at Apple so far in a sprawling and bitter legal fight. From a report: The San Diego-based company aims to inflict pain on Apple in the world's largest market for smartphones and cut off production in a country where most iPhones are made. The product provides almost two-thirds of Apple's revenue. Qualcomm filed the suits in a Beijing intellectual property court claiming patent infringement and seeking injunctive relief, according to Christine Trimble, a company spokeswoman. "Apple employs technologies invented by Qualcomm without paying for them," Trimble said. An Apple spokesman didn't immediately respond to a request for comment on Friday. Qualcomm's suits are based on three non-standard essential patents, it said. They cover power management and a touch-screen technology called Force Touch that Apple uses in current iPhones, Qualcomm said. The inventions "are a few examples of the many Qualcomm technologies that Apple uses to improve its devices and increase its profits," Trimble said. The company made the filings at the Beijing court on Sept. 29. The court has not yet made them public.